Excavating-scraper.



E. JOHNSON.

BXGAVATING SGRAPER. APPLIOATION FILED MAR. 30, 1911.

Patented Feb. 13, 1912.

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ERIC JOHNSON, OF SEATTLE, WASHINGTON.

EXCAVATING-SCRAPER.

Specification of Letters Patent.

Patented Feb. 13,1912.

Application filed March so, 1911. Serial No. 617,847.

the agency of power operated cables.

The invention consists in the novel constructlon and combination of devlces as Wlll be hereinafter described and claimed.

- from a supporting platform.

The reference numerals 5 designate the side plates; 6, the bottom plate;.7, the back plate; and 8, the roof plate which extends for a distance forwardly from the top of said back plate. These plates constitute the walls of a scraper-body which is open at the front. It is also open at the top except where the same is closed by the plate 8 and by a hinged plate or shutter 9 when the latter is actuated by the material in being loaded into the scraper.

The shutter 9 is connected by hinge members 10 to a rod 11 which extends transversely through the side plates 6 or, as shown, is supported by brackets 12 projecting upwardly from the forward ends of such side plates. This shutter is arranged to have its lower edge normally rest on the scraper bottom, as represented in Fig. 1, and in proximity to the back plate 7. The hinge members 10 are each provided with an arm 13 extending forwardly from the rod 11 and carry at their outer ends pins 14 upon which are mounted rollers 15. Adjacent to the side walls are rollers 16 mounted upon the rod 11 and in spaced relation thereabove is an other rod, also supported by the brackets 12, and upon which are mounted rollers 17 At the rear of the scraper are brackets 18 secured rigidly to its side walls. Transverse rods 19 and 20 are supported by the brackets 18 above the scraper body, and likewise accommodate transversely arranged axle elements 21 extending from scraper body and serving as journals for rollers 22. The rods 19 and 20, respectively, serve to carry rollers 23 and 24. Extending through the spaces intermediate rollers 16 and 17 and also between the rollers 23 and 24 are bow-shaped bars 25 having their convex edges uppermost. Connecting the front and rear ends of said bars are tie rods 26 and 27. On the former, 26, is desirably mounted a roller 28 which is designed to encounter the ground during the filling operations for preventing undue penetration of the cutting edge 6 of the scraper bottom.

29 is a bail by which the hauling line 30 is connected to the front end of the frame A comprised of the bars 25 and tie-rods 26 and 27. A haul-back line 31 is connected to the other end of this frame, as by a link 32, secured to the rod 27.

Rigidly secured to, or formed with, the frame bars 25 are upwardly extending lugs 33 which limit the relative backward movement of the frame by coming into contact v with the roller 17. Protruding downwardly from the bars 25 are catches 34 having sloping rear faces 35. The catches 34 are disposed to be in proximity to the forward end of the frame.

In Fig. 4, 37 represents an inclined way extending from the ground and supported by posts 38. 39 represents one of a pair of rails connecting with a pair of inclined rails 39 which are respectively spaced apart to accommodate the body of the scraper therebetween but serving as supports for rollers 22 whereby the scraper is sustained upon such rollers as pivotal points to allow of the scraper being dumped. This structure is employed at the place where a scraper is to be automatically dumped and the rails 39 positioned at such a height as to accommodate therebetween a sluice-box, wagon, or other receptacle into which the successive loads of the scraper are to be deposited.

The operation of the invention may be explained as follows: Assume that frame A occupies the position in which it is illustrated in Fig. 1 and secured against longitudinal displacement through the medium of rollers 15 and 17 engaging the catch and lug elements 34 and 38, respectively, of the frame. Under such conditions, a pull eX- erted by the haul line 30 through the frame bail 29 will drag the scraper forward and with the bottom 6 inclined slightly down toward the front by reason of the pulling force being applied in a line near the top of the scraper. This inclination will cause the cutting edge 6 of the bottom to be most effectually presented for digging. When the scraper has been thus dragged forward, excavated material will be piled up within the same and forced back against the shutter 9 to eventually tilt the shutter upwardly with a correspondingly downward movement being imparted to the arms 13 which withdraws the rollers 15 from in front of the catches 34. The frame A being thus released is drawn by the haul-line 30 forwardly until arrested by the frame-rod 27 encountering the brackets 18.

By reason of the bow-shape of the frame, as the latter is moved forward, its forward end to which the haul line it attached is carried downwardly into the position in which it is represented in Fig. 3, thus transposing the line of force exerted through the haul line to be below the center of gravity ,of the scraper so that the further pull of the haul line will tilt the front end of the scraper upwardly and it will continue its travel with the rear end. of its bottom sliding on the ground instead of being with the cutting edge 6 lowermost. As the body of the scraper is drawn up the way 37 between the rails 39', the rollers 22 track upon the same until they reach the rails 39 and whereby the scraper is suspended through the agency of the rollers 22. By slackingthe line 30 the front end of the scraper will be come unsupported with the resultthat the unbalanced forward portion of the scraper will fall to discharge the load, as indicated in Fig. 4:. After being unloaded, the haul back line is operated, causing the frame A to be first restored to the position in which it is shown in Fig. 1 followed by the dragging of the scraper backward to the place where a new load is to be had. From the foregoing, it is to be noted that while loading the scraper is tilted forwardly and after receiving its load the scraper is tilted rearwardly, both of which functions are accomplished through medium of a single hauling line subject to the action of the shutter.

The advantages derived from the control of the scraper reside in the fact that the former of such conditions is suitable for digging and filling, while the back tilting adapts the scraper for use in hauling auriferous material in mining operations where it is the aim to retain the heavier and more fugitive portion of the material which seeks the lowest point. The control of the scraper by the hauling line so that the scraper can be dumped automatically is likewise of importance and renders the apparatus suitable for use in many situations.

The invention is of simple construction, durable in operation and is effective in the accomplishment of the work for which in tended.

What I claim, is-

1. In a scraper, the combination with the body, of a draft frame connected with the body for endwise motion, a hauling line secured to an end of said frame, a haul back line secured to the other end of the frame, means for limiting the movement of said frame with respect to the body, means for releasably securing the frame against endwise motion, and devices actuated by a load taken into the scraper whereby said framesecuring means is rendered inoperative.

2. In a scraper, the combination with the body, of a bow-shaped draft frame connected with the body for endwise motion, a hauling line secured to an end of said frame, a haul back line secured to the other end of the frame, means for limiting the movement of said frame with respect to the body, means for releasably securing the frame against longitudinal motion, and devices actuated by a load taken into the scraper whereby said frame-securing means is rendered inoperative.

3. A scraper comprising a body, a draft frame connected with the body for longitudinal movements, stops at both ends of the frame for limiting the relative movement of the body, a catch upon the forward end of the draft frame, a plate hingedly connected to the body, and an arm secured to the plate adapted to be engaged by said catch and released when said plate is de flected upwardly.

4. In a scraper, the combination with the body, of a draft frame slidably connected to said body, a catch on said frame, a plate hingedly connected to the body, and an arm secured to the plate and normally engaged with said catch, said plate being arranged to be influenced by a quantity of material scooped into the scraper so as to cause the said arm to be disengaged from said catch.

5. A scraper comprising, in combination, a body, a draft frame connected with the body for longitudinal movements, hauling and haul-back lines connected at respective ends of the frame, stops at both ends of the frame for limiting the relative movement of the body, a catch upon the forward end of,

the draft frame, a plate hingedly connected to the body, and an arm secured to the plate adapted to be engaged by said catch and released when said plate is deflected upwardly.

6. In a scraper, the combination with the body, of a bow shaped draft frame, a hauling line secured to the front end of said draft frame, a haul back line secured to the other end of the frame, means for securing frame to cause the body to be tilted rearsaid frame so that the pull applied by the wardly in the progressive movement of the 10 hauling line Will act to cause the scraper scraper.

bod to 0 crate for excavating, and means actu ated 1d; a quantity of material scooped ERIC JOHNSON into the scraper whereby said securing means Witnesses is rendered inoperative and a pull exerted PIERRE BARNES,

by said hauling line will influence the draft E. PETERSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

